Project Overview

The shield consists of a temperature sensor, a motion sensor, an LDR, and a 3 pin socket where you can connect any output, we’ll be using a relay module.

We’ll also write a program that runs a web server to control the shield using 4 different modes with several configurable settings.

Automatic motion mode, meaning that when it detects motion the relay stays on for a determined number of seconds.

Or you can use the luminosity mode, so the relay turns on when the light goes below a certain threshold value.

Finally, there’s an option to control the relay based in the current luminosity value and if motion is detected.

Multisensor Shield Features

The Multisensor Shield features several sensors that can be useful to monitor your house. The shield allows you to control:

1x SMD LED to indicate a status

1x Light dependent resistor (LDR)

1x DS18B20 temperature sensor

1x PIR motion sensor

Additionally, it also features a terminal block that gives you access to GND, 5V and GPIO15. That terminal can be used to connect a relay, or any other output you might want to control.

Testing the Circuit on a Breadboard

Before designing and building the PCB shield, it’s important to test the circuit on a breadboard. If you don’t want to make a PCB, you can still follow this project by assembling the circuit on a breadboard.

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Parts Required

To assemble the circuit on a breadboard you need the following parts:

ESP8266 Wemos D1 Mini – read Best ESP8266 Wi-Fi Development Board

1x 5mm LED

1x 330 Ohm resistor

1x DS18B20 temperature sensor

1x mini PIR motion sensor

1x light dependent resistor

2x 10k Ohm resistor

1x relay module

Breadboard

Jumper wires

Schematic

After gathering all the parts, assemble the circuit by following the next schematic diagram:

Here’s the circuit diagram: